#coding=utf-8
import os
import random

start = 8000000
size = 8000000
data_file = open('./{}.data'.format(start),'w')
i = start
str = ''
while i < start + size:
    str +='{:012d},{}\n'.format(i, random.randint(0,255))
    i += 1
data_file.write(str)
data_file.close()